Even the best training cannot make you ready for a real situation.
Sadly, this is very true. The difference is adrenaline dump. Something instructors cannot replicate in a training session. They can use timers and rapid physical movement and even noise to induce some stress, but you always feel at least somewhat safe in training, the instructors have to keep things safe for liability reasons, although advanced and level 3 tactical courses will introduce maneuvers that they would never do in an entry level course.
Ive done more weapons training than I will discuss here, and I can tell you first hand that if you are caught off guard in a life and death situation and adrenaline dump kicks in, you will be compromised in ways you would normally think impossible because you have never experienced it.
I was in my van on the side of the road in a bad neighborhood talking to a home warranty company about a job I was on and my focus was on my paperwork in my lap, not on my surroundings, and a 260 lb predator with a hunting knife explodes into the passenger side and wants whatever money I have (I do appliance work) He scared me so bad I had full adrenaline dump for the first time in my life and I got my hands on my Sig 226 as I was opening the door to get out and put some space between us. Every motor function I had was compromised. Getting my weapon out, and into a fire-ready position with sights on target was much harder than I anticipated because I was trying to do everything WAY too fast due to the adrenaline. All the muscle-memory I had trained to develop was greatly compromised. The 1 thing that did happen due to all my training was I could tell that if I put my finger on the trigger I would have shot the idiot without necessarily meaning to. I left my finger on the trigger guard and told him he had 3 seconds to outrun this bullet, and he shot out of the van and hauled ass. My hands were so twitchy that proper manipulation of a modified SRT race trigger in my Sig was impossible. There is a reason a lot of carry pistols have a heavy trigger. I had never considered why...
I always thought "cheaper guns have heavier triggers"... "Heavy triggers are not accurate"....
I can only imagine a situation where kids in a school are involved, adrenaline dump kicks in and you have to start making considerations such as kids running all around while you try to find a safe angle to hit the perp without hitting the very kids your trying to save.
That one 15 second occurrence changed everything for me, and forced me to realize that even with more training than most LE guys, when it really counts, there are things that will happen that will greatly reduce your ability to do what must be done that your training could not address.
The other time I was almost robbed I saw the guy coming and knew full well he would puss out when I threw that pistol up in his face, so adrenaline dump was not an issue and my training worked just as it should have. I did not shoot either of those guys, although I could have legally shot both of them. I have to work in those places where the wolves have taken over, but there are still some good people in there who can't help what has happened to their neighborhoods over the years.